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Grade 1 · Math · Building Confidence

Free Subtraction Within 20 worksheet - version 6

Build subtraction fluency with numbers through 20. This printable version includes 14 grade-appropriate questions and a separate answer sheet.

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Subtraction Within 20

Grade 1 · Building confidence · 14 questions · Version PG-BAFGN1-1PAM

Free printable
1.16 - 1 =
2.18 - 11 =
3.9 - 9 =
4.10 - 6 =
5.13 - 12 =
6.2 - 1 =
7.19 - 12 =
8.13 - 10 =
9.6 - 4 =
10.3 - 2 =
11.15 - 9 =
12.20 - 18 =
13.8 - 3 =
14.9 - 2 =
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Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 6
  1. 16 - 1 =15
  2. 18 - 11 =7
  3. 9 - 9 =0
  4. 10 - 6 =4
  5. 13 - 12 =1
  6. 2 - 1 =1
  7. 19 - 12 =7
  8. 13 - 10 =3
  9. 6 - 4 =2
  10. 3 - 2 =1
  11. 15 - 9 =6
  12. 20 - 18 =2
  13. 8 - 3 =5
  14. 9 - 2 =7

Worked example

16 - 7 = 9. Break 7 into 6 and 1: 16 - 6 - 1 = 9.

Common mistake

Switching the order of the numbers because subtraction is not commutative.

Helpful hint

Count back to 10, then subtract what remains.